feat(BaseChannel): add permissions and appPermissions (#11577)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/discord.js/src/structures/BaseChannel.js

@@ -5,6 +5,7 @@ const { DiscordSnowflake } = require('@sapphire/snowflake');
 const { ChannelType, Routes } = require('discord-api-types/v10');
 const { ChannelFlagsBitField } = require('../util/ChannelFlagsBitField.js');
 const { ThreadChannelTypes } = require('../util/Constants.js');
+const { PermissionsBitField } = require('../util/PermissionsBitField.js');
 const { Base } = require('./Base.js');
 
 /**
@@ -46,6 +47,31 @@ class BaseChannel extends Base {
      * @type {Snowflake}
      */
     this.id = data.id;
+
+    if ('permissions' in data) {
+      /**
+       * The computed permissions of the user who invoked the interaction in this channel, including overwrites.
+       * <info>This is only present on channels received through an interaction's resolved data.</info>
+       *
+       * @type {?Readonly<PermissionsBitField>}
+       */
+      this.permissions = new PermissionsBitField(data.permissions).freeze();
+    } else {
+      this.permissions ??= null;
+    }
+
+    if ('app_permissions' in data) {
+      /**
+       * The computed permissions of the application in this channel, including overwrites.
+       * <info>This is only present on channels received through an interaction's resolved data, and only when the
+       * application's bot user is in the guild.</info>
+       *
+       * @type {?Readonly<PermissionsBitField>}
+       */
+      this.appPermissions = new PermissionsBitField(data.app_permissions).freeze();
+    } else {
+      this.appPermissions ??= null;
+    }
   }
 
   /**

packages/discord.js/typings/index.d.ts

@@ -900,6 +900,8 @@ export abstract class BaseChannel extends Base {
   public get createdTimestamp(): number | null;
   public id: Snowflake;
   public flags: Readonly<ChannelFlagsBitField> | null;
+  public permissions: Readonly<PermissionsBitField> | null;
+  public appPermissions: Readonly<PermissionsBitField> | null;
   public get partial(): false;
   public type: ChannelType;
   public get url(): string;

packages/discord.js/typings/index.test-d.ts

@@ -2270,6 +2270,10 @@ client.on('interactionCreate', async interaction => {
         interaction.options.getChannel('test', false, [ChannelType.GuildForum, ChannelType.GuildVoice]),
       );
       expectType<MediaChannel>(interaction.options.getChannel('test', true, [ChannelType.GuildMedia]));
+
+      const resolvedChannel = interaction.options.getChannel('test', true);
+      expectType<Readonly<PermissionsBitField> | null>(resolvedChannel.permissions);
+      expectType<Readonly<PermissionsBitField> | null>(resolvedChannel.appPermissions);
     } else {
       expectType<ChatInputCommandInteraction>(interaction);
       expectType<Promise<InteractionCallbackResponse>>(interaction.reply({ withResponse: true }));